KR102032787B1 - Penetration test device for geotechnical site investigation - Google Patents

Abstract

The present invention relates to a penetration test device for soil surveying of a site. The penetration test device for soil surveying of a site is provided to collect a specimen to classify the ground and embed a sampler to a predetermined depth by hitting the sampler to simultaneously evaluate and classify the site′s strength. To achieve the purpose of the present invention, the penetration test device for soil surveying of a site includes: the sampler (10) collecting the specimen by being embedded into a ground excavation hole (100); a hitting unit providing hitting energy to the sampler (10); an anvil (30) connected to the upper part of the sampler (10) by a connection rod (20) for a hitting force of the hitting unit to be transmitted; and a penetration measuring unit (40) measuring a penetration rate of the sampler (10). The penetration test device for soil surveying of a site has multiple check valves (11) for discharging inner air, and the check valve (11) has a structure in which an opening and closing film (12) made of an elastic rubber material is stably supported by a support unit (13). The sampler (10) has a connection structure which can be attached and detached by a connection rod (20) and a screw thread (15, 25).

Description

Penetration test equipment for ground investigation {PENETRATION TEST DEVICE FOR GEOTECHNICAL SITE INVESTIGATION}

The present invention relates to a ground survey in the field of civil engineering, and more particularly, a penetration test apparatus for injecting soil into a predetermined depth by striking a sampler to evaluate and classify the strength of the ground at the same time as the sampling of the ground. It is about.

In general, the ground survey is an essential survey for the safe and economical design and construction of structures in civil engineering, as well as for the maintenance, repair and safety diagnosis of existing structures.

The ground condition is used to determine the condition of the ground, the strata structure, and the bearing capacity.The obtained ground survey results are used to construct the structure to be constructed safely and economically, and to use it as basic data for maintaining and managing the structure in the future. Done.

Therefore, accurate and reliable ground survey should be carried out on the target ground, but since the types of ground are very diverse, it is impossible to apply the same ground survey technique to all the grounds. In addition, various ground survey techniques have been proposed according to the characteristics of the ground, and the ground survey method and analysis method suitable for each ground characteristic should be determined.

For example, in some cases, the cone penetration test is used to investigate the ground of soft ground, but the standard penetration test for most grounds in Korea is due to the advantages of the test method and the ease of sampling. : SPT) is the most widely used. In addition, the standard penetration test for conventional ground surveying hits the top (anvil) of the rod connected to the split spoon sampler by freely dropping 635 kg of metal hammer at a height of 75 cm. In-situ test that intrudes the sampler into the ground, measures the penetration and the number of hits of the sampler, and collects the disturbance sample (based on KS F 2307) .The number of hammer strikes required for 30 cm penetration of the sampler is called N value. Using the N value, the hardness of the strata can be evaluated or various ground constants can be empirically calculated.

In addition, in North and South America, about 85 to 90% of the general basic design is carried out based on the standard penetration test (Bowles, 1988). In Japan and Korea, most geotechnical designs result from this test. It depends on the situation. In principle, such a test is limited to sandy soil, but in Korea, this test is also used in various kinds of soils.

However, in the standard penetration test, the sampler is difficult to penetrate in the hard strata, gravel, and soft rock due to the constraints of the sampler's diameter and the impact energy, and there are many problems in calculating the reliable N value.

On the other hand, in the prior art to improve this in the domestic patent registration No. 915544 has been disclosed a technology related to large penetration test apparatus for the ground survey.

On the other hand, in the prior art, a ball valve and an air outlet are formed in the upper part of the sampler for discharging the internal air, and foreign matter enters through the formed air outlet so that clogging of the ball valve occurs, which makes it difficult to smoothly discharge the air. there was.

In addition, there is a structure in which the rod is integrally connected to the upper part of the sampler, but the conventional sampler has a problem in that the cost increases because the upper rod must be replaced together when deformation or damage occurs in the penetration process.

Korea Patent Registration No. 915544 (2009.08.28.Registration) Republic of Korea Utility Registration No. 245820 (registered on August 28, 2001)

The present invention has been proposed to improve the above-described problems in the prior art, by providing a technology that can be made more quickly and at a lower cost while the air is discharged smoothly in the sampler intrusion process, the ground investigation The purpose is to improve work efficiency in the process.

The present invention for achieving the above object, the sampler is introduced into the ground to take a sample, the striking means for providing the striking energy to the sampler, and the anvil is configured by connecting rods connected to the upper sampler to transmit the striking force of the striking means And a penetration check means for measuring a penetration amount of the sampler, wherein the sampler is provided with a plurality of check valves for discharging internal air, and the check valve is made of an elastic rubber material. The opening and closing membrane forms a structure which is stably supported by the support; The sampler is characterized by forming a detachable coupling structure by the connecting rod and the thread.

In addition, the striking means is characterized in that the drive cylinder is driven by a hydraulic or pneumatic method, and the hammer is made up and down by the drive cylinder.

The penetration test apparatus for the ground survey of the present invention, it is possible to use in a variety of ground, such as hard strata, gravel layer, soft rock, etc., it is possible to derive the number of blows when the sampler intruded to a certain depth to obtain and use the test data It shows the effect of improving the efficiency.

In particular, it is possible to easily replace the sampler, which shows the advantage of improving the discharge reliability of the air using the check valve.

1 is a schematic block diagram of a penetration test device for soil survey according to an embodiment of the present invention.
2 is a cross-sectional view of a sampler in the present invention.
3 is an enlarged view of a portion A of FIG. 2;
Figure 4 is a perspective view of the check valve component in the present invention.
5 is an exploded view of the check valve component in the present invention.
6 is a state diagram of the penetration test apparatus of the present invention.
7 is a cross-sectional view of a check valve change state according to the operation of the present invention.
8 is a cross-sectional view of a sampler according to another embodiment of the present invention.
9 is an enlarged view of a portion B of FIG. 8;
10 is a cross-sectional view of the check valve according to another embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Embodiments of the invention may be modified in various forms, the scope of the invention should not be construed as limited to the embodiments described in detail below. This embodiment is provided to more completely explain the present invention to those skilled in the art.

Therefore, the shape of the components, etc. represented in the drawings may be exaggerated to emphasize a more clear description. It should be noted that the same configuration in each drawing is shown with the same reference numerals. In addition, detailed descriptions of functions and configurations of well-known technologies that are determined to unnecessarily obscure the subject matter of the present invention may be omitted.

First, looking at the configuration of the penetration test device for soil survey according to an embodiment of the present invention through FIGS. 1 to 5 as follows.

The ground test penetration test apparatus according to the present embodiment includes a sampler 10 that is inserted into the ground drilling hole 100 to collect a sample, a blower that provides blow energy to the sampler 10, and the blower means. Anvil 30 configured to be connected by a connecting rod 20 to the upper part of the sampler 10 to transmit the striking force of the sampler, and for measuring the penetration amount of the sampler 10 and the number of times of the hitting means for the anvil 30. Intrusion measurement unit 40 is included.

In particular, the sampler 10 in the present invention is provided with a plurality of check valves 11 for discharging the internal air, the check valve 11 is an elastic rubber opening and closing membrane 12 of the support 13 A structure that is stably supported while preventing external detachment is prevented, and the sampler 10 forms a detachable coupling structure by the connecting rod 20 and the threads 15 and 25.

In addition, the striking means is composed of a drive cylinder 50 is driven in a hydraulic or pneumatic manner, and the hammer 60 is raised and lowered by the drive cylinder 50.

In the present embodiment, when the penetration measurement unit 40 strikes the anvil 30 with the hammer 60, the penetration depth of the sampler 10 is measured and recorded with an error within 1 mm per each stroke, and the sampler is It consists of normal automatic measuring equipment that records the penetration depth when 300 mm penetration is performed.

In the figure, reference numeral 10a is a shoe integrally provided under the sampler 10, and 16 represents a fastening groove 16 having a thread 15 formed on an inner circumferential surface thereof.

The effect of the operation of the penetration test device for soil investigation of the present invention constituting such a configuration will be described.

First, boring equipment is used to excavate the ground to the desired depth to form the ground excavation hole 100, the installation of the penetration test apparatus of the present invention in a state in which the casing (not shown) is installed so as not to collapse the ball wall. .

That is, in this case, while positioning the sampler 10 connected to the connecting rod 20 on the ground surface of the ground drilling hole 100 and the hammer 60 and the cylinder 50 at a certain height on the anvil 30 The penetration measurement unit 40 is installed on one side of the ground.

In this state, when the hammer 60 hits the anvil 30 while lowering the hammer 60 as shown in FIG. 6 by the operation of the cylinder 50, the sample 10 may be introduced into the ground while the shoe 10a at the lower end of the sampler 10 penetrates into the ground. 10) will be introduced into the hollow part.

At this time, the air inside the sampler 10 is discharged to the outside through the check valve 11, the opening and closing membrane 12 blocking the check valve 11 is opened as shown in FIG. The instantaneous discharge is made, and when the air discharge is completed, the opening and closing membrane 12 is restored to its original state, so that the check valve 11 is closed to block external foreign material inflow.

On the other hand, when the sampler 10 is introduced to the depth of 300mm in accordance with the downward strike of the hammer 60, the number of hits at that time is automatically recorded by the penetration measurement unit 40 to stop the hammer 60 hitting the sampler 10 To the ground.

The number of hammer hits, N, investigated through the above process is used to determine the characteristics of the ground, and the collected samples can be used to determine the soil properties and to evaluate the physical properties of the ground through various related experiments. do.

In addition, when deformation or breakage of the sampler 10 occurs in the penetration process, the disassembly and replacement of the sampler 10 may be performed quickly and easily.

Therefore, the penetration test apparatus for ground investigation of the present invention can be utilized in various grounds such as hard strata, gravel layers, soft rocks, etc., and it is possible to derive the number of blows when infiltrating the sampler to a predetermined depth, thereby acquiring and utilizing test data. It shows the effect of improving the efficiency.

In particular, it is possible to easily replace the sampler using the screw fastening method, and also has the advantage of improving the reliability of the discharge of air using the check valve in the penetration process.

On the other hand, Figures 8 and 9 show a configuration according to another embodiment of the present invention, the center of the check valve 11 is provided with a guide wall 11 'for guiding the incoming air to the outside to form a predetermined curvature shape In addition, an elastic spring 12a is embedded in the opening / closing membrane 12 which controls the opening and closing of the check valve 11 so as to quickly return to the original state after opening the flow path, and the support 13 has an elastic spring 12a. The through hole 13a through which the through hole 13 is formed is formed, and the brush 12b is provided at the edge of the opening / closing membrane 12 so as to remove foreign substances due to friction with the inner wall surface of the check valve 11 during the opening and closing process.

When such a configuration is achieved, the air discharged from the sampler 10 is guided to the outside by the guide wall 11 'so that the opening / closing operation of the opening and closing membrane 12 is made more effective, and the elastic spring 12a Due to the elastic action, the elastic action force of the opening and closing membrane 12 is doubled so that the operation of closing the flow path after discharge of air is made more quickly, and the opening and closing failure due to the deformation of the opening and closing membrane 12 can be prevented. do.

In addition, since the brush 12b is repeatedly rubbed with the inner wall of the check valve 11 in the opening and closing process, contamination of the foreign matter adhered to the inner wall is prevented.

On the other hand, Figure 10 shows a configuration according to another embodiment of the present invention, a fastening groove 16 formed with a thread 15 for screwing the connection rod 20 is formed on the sampler 10, An elastic pad 17 is provided on the bottom surface of the fastening groove 16, and the elastic pad 17 is elastically supported by the elastic spring 18.

In addition, it can be seen that the reinforcing coating layer 14 is formed on the inner wall of the sampler 10 to improve durability and prevent oxidation. At this time, the reinforcing coating layer 14 is 20 to 40% by weight of epoxy resin, 10 to 30% by weight of silicon powder, 10 to 30% by weight of thermoplastic elastomer, 1 to 10% by weight of zinc oxide, 1 to 10% by weight of glass fiber, pyridoxine acid It is preferable to achieve the mixed composition of 1 to 5 weight% and 1 to 5 weight% of olefins.

When such a configuration is achieved, the double impact force by the elastic pad 17 and the elastic spring 18 is applied in the process of fastening the sampler 10 to the connecting rod 20, thereby hitting the impact force of the hammer 60. The loosening between the sampler 10 and the connecting rod 20 is prevented due to the stable coupling state can be maintained.

In addition, since the silicon powder and the thermoplastic elastomer are mixed in the reinforcing coating layer 14, the durability and strength of the sampler 10 may be increased, and zinc oxide prevents wall oxidation caused by contact with the sample. In particular, pyridoxine acid increases the binding force between the thermoplastic elastomer and the silicon powder particles, and the olefin, which is an unsaturated hydrocarbon, functions to maintain the overall thickness through the stabilization of the coating layer.

In addition, although specific embodiments of the present invention have been described and illustrated above, it is obvious that the structure of the penetration test apparatus of the present invention may be variously modified and implemented by those skilled in the art.

For example, in the above embodiment, although the hydraulic or pneumatic cylinder is used as the striking means, it is possible to apply various methods such as freely dropping the hammer, if necessary.

Therefore, such modified embodiments should not be understood individually from the spirit or scope of the present invention, such modified embodiments will be included within the appended claims of the present invention.

10: sampler 11: check valve
12: opening and closing membrane 13: support
15,25 thread 16: fastening groove
20: Connection Rod 30: Anvil
40: penetration measurement unit 50: cylinder
60: hammer 100: ground excavator

Claims (5)

A sampler 10 that is introduced into the ground drilling hole 100 to collect a sample, a hitting means for providing a hitting energy to the sampler 10, and a connecting rod on the upper part of the sampler 10 so that the hitting force of the hitting means is transmitted. In the ground irrigation penetration test apparatus comprising an anvil (30) configured by the (20) and a penetration measurement unit 40 for measuring the penetration amount of the sampler 10,
The sampler 10 includes a plurality of check valves 11 for discharging internal air, wherein the check valve 11 is stably supported by an opening and closing membrane 12 made of elastic rubber. Structure;
The sampler 10 forms a detachable coupling structure by the connecting rod 20 and the threads 15 and 25;
A guide wall 11 'is provided at the center of the check valve 11 to guide the inflowing air to the outside, and the elastic membrane 12a is provided at the opening and closing membrane 12 so as to quickly return to the original state after opening the flow path. It is embedded in the interior, the support 13 is formed with a through hole 13a through which the elastic spring 12a penetrates, and the foreign material on the inner wall surface of the check valve 11 in the opening and closing process at the edge of the opening and closing membrane 12. Soil penetration test apparatus, characterized in that provided with a brush (12b) to be removed. The method according to claim 1,
The striking means is a ground test penetration test apparatus, characterized in that consisting of a drive cylinder (50) which is driven in a hydraulic or pneumatic manner, and a hammer (60) is raised and lowered by the drive cylinder (50). delete A sampler 10 that is introduced into the ground drilling hole 100 to collect a sample, a hitting means for providing a hitting energy to the sampler 10, and a connecting rod on the upper part of the sampler 10 so that the hitting force of the hitting means is transmitted. In the ground irrigation penetration test apparatus comprising an anvil (30) configured by the (20) and a penetration measurement unit 40 for measuring the penetration amount of the sampler 10,
The sampler 10 includes a plurality of check valves 11 for discharging internal air, wherein the check valve 11 is stably supported by an opening and closing membrane 12 made of elastic rubber. Structure;
The sampler 10 forms a detachable coupling structure by the connecting rod 20 and the threads 15 and 25;
The inner wall surface of the sampler 10 is formed with a reinforcing coating layer 14 for improving durability and preventing oxidation, and the reinforcing coating layer 14 is epoxy resin, silicon powder, thermoplastic elastomer, zinc oxide, glass fiber, pyridoxine acid, and olefin. Soil penetration test apparatus, characterized in that to form a mixed composition of. A sampler 10 that is introduced into the ground drilling hole 100 to collect a sample, a hitting means for providing a hitting energy to the sampler 10, and a connecting rod on the upper part of the sampler 10 so that the hitting force of the hitting means is transmitted. In the ground irrigation penetration test apparatus comprising an anvil (30) configured by the (20) and a penetration measurement unit 40 for measuring the penetration amount of the sampler 10,
The sampler 10 includes a plurality of check valves 11 for discharging internal air, wherein the check valve 11 is stably supported by an opening and closing membrane 12 made of elastic rubber. Structure;
The sampler 10 forms a detachable coupling structure by the connecting rod 20 and the threads 15 and 25;
The upper part of the sampler 10 has a fastening groove 16 formed with a screw thread 15 for fastening the screw with the connecting rod 20, and an elastic pad 17 is provided on the bottom surface of the fastening groove 16. And, the elastic pad 17 is ground penetration penetration test apparatus, characterized in that the elastic support is made by the elastic spring (18).

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